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====== Lines of Position GC Sailing ======

 {{opencpn:software:Chart Work.gif?nolink&552x465}}

Chart Work - Traditional paper chart work on an ECS.

=====   Coastal navigation  =====

the three types of lines of position used are:

  * Bearing
  * Range
  * Horizontal angle﻿

{{opencpn:software:3 bearing fix.png?nolink&900x675}}

Fix by three simultaneous bearings.

=====   Celestial navigation   =====

Offshore navigators use celestial navigation,sextant observations, as a backup for the GPS. Use a sextant for taking the altitude of a celestial body and OpenCPN to plot the celestial circle of position instead the LoP -Line of Position-. Repeat this and take at least three sights. You easily can check if any danger is near your fix, and the uncertainty in your position.

 \\ {{opencpn:software:CoP Parameters.png?nolink&571x568}}

Parameters of a circle of position in astronavigation.

  * [[http://www.mediafire.com/download.php?pp89of9q9fk4rbi|Method explained]]

=====   Route using the three types of sailings   =====

  * Rhumb Line. Direct with OpenCPN (And also using Plugin Route_pi).
  * Great Circle(Direct in OpenCPN using using Plugin Route_pi).
  * Composite(Direct in OpenCPN using using Plugin Route_pi).
The three types of sailing are also available in ChartWork

{{opencpn:software:Composite Sailing route.png?nolink&748x663}}

Composite Route.

{{opencpn:software:Composite Sailing route.OpenCPN.png?nolink&900x675}}

Composite Route plot with OpenCPN.

===== Radionavigation =====

RDF or radiogoniometer provide a bearing. Its line of position may be plot using GPX input. Two options:

  * RDF onboard
  * RDF on station

{{:opencpn:software:rdf.png?nolink&900x675}}

Fix by two RDF bearings with OpenCPN.

